Browse "Science & Technology"

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Article

Chiropractic

Chiropractic is the manipulation of the spinal column as a means of curing disease. The word comes from the Greek chiro ("hands") and practic ("to practice"). The theory of chiropractic originated with D.D. Palmer, who was born in Port Perry (Ontario) in 1845.

Article

Cholera in Canada

Cholera first reached Canada in 1832, brought by immigrants from Britain. Epidemics occurred in 1832, 1834, 1849, 1851, 1852 and 1854. There were cases in Halifax in 1881. The epidemics killed at least 20 000 people in Canada.

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Chronic Fatigue Syndrome

This article was originally published in Maclean’s magazine on April 15, 2002. Partner content is not updated.

Ashley Roll's mother is reluctant to have her come to the phone. She's worried that answering questions will take too much out of the 19-year-old, but Ashley says she's feeling up to it. Because of chronic fatigue syndrome, Roll is almost a prisoner of her home in Burnaby, B.C.

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Chronic Fatigue Syndrome Recognized

This article was originally published in Maclean’s magazine on May 4, 1998. Partner content is not updated.

Sharon Baillie once loved to read. Not any more. By the time she gets to page 3 of a book, she has generally forgotten what she read on page 1. She used to enjoy 25-km hikes on weekends. Now, she can barely manage a 20-minute walk with her golden retrievers, Buddy and Dusty.

Article

Churchill Falls

The project was undertaken by a subsidiary of British Newfoundland Corp Ltd (Brinco), and was at the time the largest civil engineering project ever undertaken in North America. Eighty strategically placed dikes pooled the vast waters of the Labrador Plateau in the Smallwood Reservoir.

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Cigarette Packaging

This article was originally published in Maclean’s magazine on January 31, 2000. Partner content is not updated.

Perhaps, but if Rock gets his way cigarette packaging is about to go from colourful and cool to downright disturbing.

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Civil Engineering

Before the multiplication of engineering disciplines in the late 19th and early 20th centuries, engineers were either military or civilian. Civilian engineers built nonmilitary structures; those in the military concentrated on FORTIFICATIONS.

Article

Climate Change

Climate change occurs when long-term weather patterns begin to shift. These periods of change have occurred throughout the Earth’s history over extended periods of time. However, since the Industrial Revolution the world has been warming at an unprecedented rate. Because of this, the current period of climate change is often referred to as “global warming.” Human activities that release heat-trapping greenhouse gases, such as the burning of fossil fuels, are largely responsible for this increased rate of change. The implications of this global increase in temperature are potentially disastrous and include extreme weather events, rising sea levels and loss of habitat for plants, animals and humans. In Canada, efforts to mitigate climate change include phasing-out coal-fired power plants in Ontario and instituting a carbon tax in British Columbia.

(This is the full-length entry about climate change. For a plain-language summary, please see Climate Change (Plain-Language Summary).)

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Climate Information

Climate information is used by a variety of people. Building designers must be certain that their structures will withstand the strongest winds and be habitable during temperature extremes. Airlines, when possible, plan their routes to take advantage of the prevailing winds in the upper atmosphere.

Article

Climate Severity

 Environment Canada devised the climate severity index to rate a locality's climate according to human comfort and well being. The index has a range from 1 to 100, with a score of 1 representing the least severe climate and 100 the most.

Article

Climatology

The study of modern climatology is primarily global in perspective. The main tools used by climatologists are computer models of the atmosphere, ocean and land surface, and data inferred from SATELLITE observations.

Article

Clocks and Watches

The manufacture of clocks and watches in Canada may have begun as early as 1700; however, practising watch and clockmakers through the 18th and much of the 19th centuries did not make the movements.

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Cloning Sheep

For more than a decade, scientists have been using genetic technology to produce biologically identical copies, or clones, of animals. In theory, cloning can be used to improve sheep and cattle breeds by ensuring that the animals' most desirable genetic characteristics are passed on.

Article

Coal Demethanation

Coal demethanation is a process by which methane gas is removed from coal deposits. The principal objective of coal demethanation, since its introduction in 1943, has been to remove the safety hazard the gas poses to miners.

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Cobalt

Cobalt (Co) is a brittle, hard, greyish-white magnetic metal that melts at 1495°C and that closely resembles iron and nickel. It is not found as a native element.

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Cod Liver Oil

Cod Liver Oil was in the past a primary source of vitamin A, essential for bone growth, health of skin and mucous membranes, and night vision. Today, many other preparations containing vitamin A are available. Before the 1920s, most cod liver oil came from Norwegian COD.